/Engine/Plugins/Media/MediaPlayerEditor/Source/MediaPlayerEditor/Public/AssetTools/MediaSourceActions.h
Optionally returns a custom widget to overlay on top of this assets' thumbnail
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< class [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > GetThumbnailOverlay ( const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & AssetData ) const